What is facing in sewing terms?

What is the difference between facing and interfacing?

As nouns the difference between facing and interfacing

is that facing is the most external portion of exterior siding while interfacing is a layer of fabric inserted between other layers of a garment to provide stiffening.

What are the characteristic of a well sewn hem?

A well-made hem should:

Be free from bulk in seams that fall within the hem area. Have fullness eased in and evenly distributed for a smooth, flat appearance. Have an edge appropriately finished for the type and weight of fabric and hem stitch to be used.

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